Modern engine operation is guided by the aim to broaden the operating range and to increase the stage loading allowing the stage count to be reduced. This is possible by active stability control measures to extend the available stable operating range. Different strategies of an active control system, such as air injection and air recirculation have been applied. While in the past results have been published mainly regarding the stability enhancement of compressor rigs or single-spool engines, this experimental study focuses on both the stability as well as the operating range extension of a twin-spool turbofan engine as an example of a real engine application on an aircraft. The objective of this investigation is the analysis of the engine behavior with active stabilization compared to unsupported operation. For this purpose, high-frequency pressure signals are used and analyzed to investigate the effects of air injection with respect to the instability onset progress and the development of any instabilities, such as rotating stall and surge in the low-pressure compression (LPC) system. These Kulite signals are fed to a control system. Its amplified output signals control fast acting direct-drive valves circumferentially distributed ahead of the LPC. For the application of air injection described in the paper, the air is delivered by an external source. The control system responsible for air injection is a real-time system which directly reacts on marked instabilities and their precursors. It allows the LPC System to recover from fully developed rotating stall by asymmetric air injection based on the pressure signals. Additionally, a delayed appearance of instabilities can be provoked by the system. Air injection guided by this control system resulted in a reduction of the required amount of air compared to constant air injection. Also, disturbances travelling at rotor speed can be detected, damped, and eliminated by this control system with a modulation of the injected air in such a way that the injection maximum travels around the ten injection positions.
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January 2006
Technical Papers
Experimental Operating Range Extension of a Twin-Spool Turbofan Engine by Active Stability Control Measures
Stephan G. Scheidler,
Stephan G. Scheidler
Institut für Strahlantriebe,
e-mail: stephan.scheidler@unibw-muenchende
Universität der Bundeswehr München
, D-85577 Neubiberg, Germany
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Leonhard Fottner
Leonhard Fottner
Institut für Strahlantriebe,
Universität der Bundeswehr München
, D-85577 Neubiberg, Germany
Search for other works by this author on:
Stephan G. Scheidler
Institut für Strahlantriebe,
Universität der Bundeswehr München
, D-85577 Neubiberg, Germanye-mail: stephan.scheidler@unibw-muenchende
Leonhard Fottner
Institut für Strahlantriebe,
Universität der Bundeswehr München
, D-85577 Neubiberg, GermanyJ. Eng. Gas Turbines Power. Jan 2006, 128(1): 20-28 (9 pages)
Published Online: March 1, 2004
Article history
Received:
October 1, 2003
Revised:
March 1, 2004
Citation
Scheidler, S. G., and Fottner, L. (March 1, 2004). "Experimental Operating Range Extension of a Twin-Spool Turbofan Engine by Active Stability Control Measures." ASME. J. Eng. Gas Turbines Power. January 2006; 128(1): 20–28. https://doi.org/10.1115/1.2031247
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